Oil-electricity hybrid hydraulic system of concrete mixer

Abstract

The utility model relates to the field of engineering machinery such as mixer trucks, in particular to an oil-electricity hybrid hydraulic system of a concrete mixer truck, which comprises a two-way variable plunger pump, an oil supplementing pump, a hand-operated direction valve, a quantitative plunger motor, an oil tank, a motor, a quantitative plunger pump, a reversing valve, a control valve and a pressure sensor. The two-way variable plunger pump, the oil supplementing pump and the diesel engine transmission shaft are connected to form a first power source; the quantitative plunger pump is connected with the motor to form a second power source; the reversing valve is connected with the first power source through an oil path; the control valve is connected with the first power source and the second power source through oil ways. The quantitative plunger motor is connected with the reversing valve and the control valve; the pressure sensor is connected with the control valve; the utility model provides an oil-electricity hybrid hydraulic system which can achieve the purposes of saving oil and saving operation cost.

Description

Technical Field

[0001] The utility model relates to the field of engineering machinery, and more specifically to an oil-electric hybrid hydraulic system of a concrete mixer truck. Background Art

[0002] At present, concrete mixer trucks are widely used in the construction of engineering buildings, bridges, airports and other infrastructure, and are key equipment for improving engineering construction. Concrete mixer trucks are special trucks used to transport construction concrete. These trucks are equipped with cylindrical mixing tanks to carry mixed concrete. The equipment transports the mixed concrete from the concrete mixing station to the construction site and then dumps the concrete to the designated location. During the transportation and return of concrete, in order to prevent the transported concrete from solidifying, the mixing tank of the mixer truck needs to rotate continuously at a low speed. Therefore, the diesel engine that provides power for the continuous low-speed rotation of the mixing tank needs to work continuously, resulting in high diesel consumption, and incomplete diesel combustion will also pollute the environment.

[0003] The patent with publication number CN115126743A discloses a mixing tank driving hydraulic system and a mixing truck, the mixing tank driving hydraulic system includes a hydraulic motor, a first pressure source and a second pressure source, the hydraulic motor is used to drive the mixing tank of the mixing truck to rotate, the first pressure source includes an engine and a first hydraulic pump, the first pressure source can deliver pressure oil to the hydraulic motor to drive the mixing tank to rotate. The second pressure source includes a motor and a second hydraulic pump, the second pressure source can deliver pressure oil to the hydraulic motor to drive the mixing tank to rotate. Although the technical solution provided by this invention patent can achieve the purpose of saving fuel, when the mixing truck is working, once one of the pressure sources fails, when the working mode of the mixing truck is switched, the driver cannot know that the diesel engine is in working state, cannot control the hydraulic system well, and is prone to misoperation; and there is a risk of hydraulic oil flowing back to the hydraulic pump, and the hydraulic system cannot be protected; when the diesel engine or the electric motor is still in working state, there are technical defects such as residual engine kinetic energy and increased fuel consumption when switching states. Summary of the invention

[0004] In order to overcome the above difficulties, the utility model provides an oil-electric hybrid hydraulic system for a concrete mixer truck. An electric motor and a new hydraulic system are added to the original diesel-driven hydraulic system. When the mixer truck needs to rotate at a high speed and high power to output concrete, the diesel engine is used for driving. When the mixer truck is driving on the road and only needs a low speed to prevent the concrete from solidifying, the electric motor is used for driving, so that the mixing tank keeps running at a low speed. At this time, the diesel engine can be turned off to achieve the purpose of saving fuel and protecting the environment, thereby saving operating costs.

[0005] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0006] A hybrid oil-electric hydraulic system for a concrete mixer truck, comprising a two-way variable piston pump, an oil replenishment pump, a manual reversing valve, a quantitative piston motor and an oil tank, the hybrid oil-electric hydraulic system also comprising an electric motor, a quantitative piston pump, a reversing valve, a control valve and a pressure sensor; the two-way variable piston pump and the oil replenishment pump are connected to the transmission shaft of a diesel engine to form a first power source; the quantitative piston pump is connected to the electric motor to form a second power source; the reversing valve is connected to the first power source through an oil circuit; the control valve is connected to the first power source and the second power source through an oil circuit; the quantitative piston motor is connected to the reversing valve and the control valve; the pressure sensor is connected to the control valve;

[0007] The oil-electric hybrid hydraulic system of the concrete mixer truck has a first working mode and a second working mode. In the first working mode, the first power source delivers pressurized oil to the quantitative piston motor; in the second working mode, the second power source delivers pressurized oil to the quantitative piston motor.

[0008] Furthermore, the reversing valve includes a one-way valve, a relief valve and a three-position four-way electromagnetic reversing valve. The three-position four-way electromagnetic reversing valve realizes forward rotation, reverse rotation and unloading of the quantitative plunger motor by switching the working position.

[0009] Furthermore, the oil inlet of the one-way valve is connected to the oil outlet of the quantitative plunger pump, and the oil outlet of the one-way valve is connected to the oil inlet of the three-position four-way electromagnetic reversing valve.

[0010] Furthermore, the control valve is simultaneously arranged on the oil circuit between the bidirectional variable plunger pump and the quantitative plunger motor, and on the main oil circuit between the quantitative plunger pump and the quantitative plunger motor.

[0011] Furthermore, the control valve includes a first logic valve, a second logic valve, and a third logic valve, which are simultaneously arranged on the oil circuit between the oil outlet of the bidirectional variable piston pump and the oil inlet of the quantitative piston motor, and on the oil circuit between the oil outlet of the quantitative piston pump and the oil inlet of the quantitative piston motor.

[0012] Furthermore, the control valve further comprises a shuttle valve, both inlets of the shuttle valve are connected to the oil outlet of the bidirectional plunger pump, and a pressure sensor is provided at the outlet of the shuttle valve.

[0013] Furthermore, the pressure sensor is used to detect whether the bidirectional variable piston pump is in a working state.

[0014] Further, the control valve includes a first solenoid valve and a second solenoid valve, the first oil port of the first solenoid valve is connected to the control oil port of the third logic valve, the first oil port of the second solenoid valve is connected to the control oil port of the first logic valve, and the second oil port of the first solenoid valve is connected to the second oil port of the second solenoid valve and connected to the oil tank.

[0015] Furthermore, when in the first working mode, the first solenoid valve and the second solenoid valve are in a de-energized state, while the first logic valve and the second logic valve are in an open state and unloaded through the switching position of the second solenoid valve, and the third logic valve is in a closed state.

[0016] Furthermore, when in the second working mode, the first solenoid valve and the second solenoid valve are in an energized state, and the first logic valve and the second logic valve are in a closed state, and the third logic valve is in an open state to unload through the switching position of the first solenoid valve, and the hydraulic pump on the diesel drive side is in an unloading state.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] 1. During the loading and unloading process of the mixer truck, the mixer truck is in the first working mode, and the first power source is used to deliver pressure oil to the quantitative plunger motor, and then the quantitative plunger motor is used to drive the mixing tank to rotate at high speed. When the mixer truck is transporting concrete and returning, the mixer truck is in the second working mode, and the second power source is used to deliver pressure oil to the quantitative plunger motor, and then the quantitative plunger motor is used to drive the mixing tank to rotate continuously at a low speed. By setting the first power source and the second power source, for example, when one of the power sources has a problem, the other power source can provide a pressure source to the motor to drive the mixing tank to rotate, thereby preventing the concrete from coagulating. This can meet the needs of different working scenarios, and can prevent the mixer truck from continuously idling the diesel engine in scenarios such as when transporting concrete or on the way back, thereby avoiding the waste of diesel resources and environmental pollution caused by incomplete combustion. Therefore, it is conducive to achieving the goals of fuel saving and environmental protection.

[0019] 2. The mixer truck is in the second working mode, the third logic valve is in the open state and is in the unloading state through the switching position of the first solenoid valve, and the hydraulic pump on the diesel engine driving side is in the unloading state, which effectively protects the diesel drive hydraulic system.

[0020] 3. By using the pressure sensor to detect whether the diesel-driven hydraulic pump is in working condition, the hydraulic system can be better controlled. When there is pressure in the pressure sensor, the bidirectional variable piston pump driven by the diesel engine is in working condition, which can prevent the motor from starting and prevent misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the hydraulic principle diagram of the oil-electric hybrid hydraulic system of a concrete mixer truck.

[0022] In the figure, 1. electric motor; 2. quantitative piston pump; 3. pressure sensor; 4. shuttle valve; 5. one-way valve; 6. overflow valve; 7. damping; 8. three-position four-way solenoid valve; 9-1. first logic valve; 9-2. second logic valve; 9-3. third logic valve; 10. first solenoid valve; 11. second solenoid valve; 12. diesel engine; 13. two-way variable piston pump; 14. manual reversing valve; 15. piston controller; 16. oil replenishment pump; 17. quantitative piston motor; 18. hot oil shuttle valve; 19. overflow valve; 20: reversing valve; 21: control valve. DETAILED DESCRIPTION

[0023] In order to clearly illustrate the technical features of the application scheme of the utility model, the utility model is described in detail below through specific implementation methods and in combination with the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0025] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, reference terms; "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like are intended to mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0028] Example 1

[0029] like Figure 1 As shown, an oil-electric hybrid hydraulic system for a concrete mixer truck includes a two-way variable piston pump 13, an oil replenishment pump 16, a manual reversing valve 14, a quantitative piston motor 17 and an oil tank, and also includes an electric motor 1, a quantitative piston pump 2, a reversing valve 20, a control valve 21 and a pressure sensor 3; wherein the two-way variable piston pump 13, the oil replenishment pump 16 are connected to the transmission shaft of the diesel engine 12 to form a first power source; the quantitative piston pump 2 is connected to the electric motor 2 to form a second power source; the reversing valve 20 is connected to the first power source through an oil circuit; the control valve 21 is connected to the first power source and the second power source through an oil circuit; the quantitative piston motor 17 is connected to the reversing valve 20 and the control valve 21; the pressure sensor 3 is connected to the control valve 21, and the pressure sensor 3 detects whether the two-way variable piston pump 12 in the first power source is in a working state, so as to better control the hydraulic system.

[0030] The mixer truck oil-electric hybrid hydraulic system has a first working mode and a second working mode. In the first working mode, the first power source delivers pressurized oil to the quantitative piston motor 17 ; in the second working mode, the second power source delivers pressurized oil to the quantitative piston motor 17 .

[0031] In this embodiment, the mixer truck is in the first working mode, the motor 1 is turned off, the diesel engine 12 drives the two-way variable piston pump 13 to output pressure oil, the manual reversing valve 14 in the diesel engine hydraulic system is connected to the piston controller 15 through a transmission shaft, and the piston controller 15 is connected to the swash plate of the two-way variable piston pump 13. Rotating the manual reversing valve 14 can realize the variable displacement of the two-way variable piston pump 12, thereby changing the size of the pressure oil flow output by the hydraulic pump. The oil replenishment pump 16 provides pressure oil for the manual reversing valve 14 and replenishes cooling oil for the entire diesel engine hydraulic system to prevent the hydraulic system from overheating. The pressure oil output by the two-way variable plunger pump 13 reaches the first logic valve 9-1 and the second logic valve 9-2. At this time, the first solenoid valve 10 and the second solenoid valve 11 are in a power-off state, the first oil port of the second solenoid valve 11 is connected to the control oil port of the first logic valve 9-1, the second oil port of the first solenoid valve 10 is connected to the second oil port of the second solenoid valve 11 and connected to the oil tank, the first logic valve 9-1 and the second logic valve 9-2 spring chamber are in a unloading state and in an open state through the spring position of the second solenoid valve 11, and the pressure oil reaches the quantitative plunger motor 17, driving the mixing tank to rotate quickly for loading and unloading. At the same time, the first oil port of the first solenoid valve 10 is connected to the control oil port of the third logic valve 9-3, and the oil circuit is blocked when the first solenoid valve 10 is in a power-off state, the spring chamber of the third logic valve 9-3 is in a non-unloading state and in a closed state, and the system works normally.

[0032] The oil inlet of the quantitative plunger motor 17 is connected to the oil inlets of the hot oil shuttle valve 18 and the relief valve 19. The hot oil of the hydraulic system is continuously allowed to flow back to the oil tank through the relief valve 19 through the hot oil shuttle valve 18 for heat dissipation.

[0033] Example 2

[0034] like Figure 1 As shown, an oil-electric hybrid hydraulic system for a concrete mixer truck includes a two-way variable piston pump 13, an oil replenishment pump 16, a manual reversing valve 14, a quantitative piston motor 17 and an oil tank, and also includes an electric motor 1, a quantitative piston pump 2, a reversing valve 20, a control valve 21 and a pressure sensor 3; the two-way variable piston pump 13, the oil replenishment pump 16 are connected to the transmission shaft of the diesel engine 12 to form a first power source; the quantitative piston pump 2 is connected to the electric motor 1 to form a second power source; the reversing valve 20 is connected to the first power source through an oil circuit; the control valve 21 is connected to the first power source and the second power source through an oil circuit; the quantitative piston motor 17 is connected to the reversing valve 20 and the control valve 21; the pressure sensor 3 is connected to the control valve 21, and the pressure sensor 3 detects whether the two-way variable piston pump 13 in the first power source is in a working state, so as to better control the hydraulic system.

[0035] The mixer truck oil-electric hybrid hydraulic system has a first working mode and a second working mode. In the first working mode, the first power source delivers pressurized oil to the quantitative piston motor 17 ; in the second working mode, the second power source delivers pressurized oil to the quantitative piston motor 17 .

[0036] In this embodiment, in the second working mode of the mixer truck, the diesel engine 12 is turned off, and the motor 1 drives the quantitative plunger pump 2 to output pressure oil. The pressure oil reaches the three-position four-way solenoid valve reversing valve 8 after passing through the one-way valve 5. When the three-position four-way solenoid valve 8 is in the middle position, the quantitative plunger pump 2 is unloaded at low pressure. When the three-position four-way solenoid valve 8 is in the left position or the right position, the pressure oil reaches the quantitative plunger motor 17 through the three-position four-way solenoid reversing valve 8, and the driving motor drives the mixing tank to rotate forward or reverse. At this time, let the first solenoid valve 10 and the second solenoid valve 11 be in the energized state, the first oil port of the second solenoid valve 11 is connected to the control oil port of the first logic valve 9-1, the second oil port of the first solenoid valve 10 is connected to the second oil port of the second solenoid valve 11 and connected to the oil tank, the first logic valve 9-1 is connected to the control oil port of the second logic valve 9-2 and is in a closed state under the action of the pressure oil of the electromagnetic reversing valve 8, which can prevent the pressure oil from leaking. At the same time, the control oil port of the third logic valve 9-3 is connected to the first oil port of the first solenoid valve 10. Since the first solenoid valve 10 is in the reversing position when it is energized, at this time, the spring chamber of the third logic valve 9-3 is in an unloading state and in an open state through the reversing position of the first solenoid valve 10, and the bidirectional variable plunger pump 13 on the hydraulic system side of the test diesel engine is in an unloading state, which effectively protects the diesel drive hydraulic system.

[0037] Example 3

[0038] like Figure 1 As shown, a hybrid oil-electric hydraulic system for a concrete mixer truck. It can be understood that in this embodiment, the pressure sensor 3 is connected to the shuttle valve 4 in the control valve 21. The pressure sensor 3 detects whether the bidirectional variable piston pump 13 in the first power source is in a working state, which facilitates better control of the hydraulic system. When the pressure sensor has pressure, the bidirectional variable piston pump 13 is in a working state, and the motor 1 can be turned off to prevent misoperation.

[0039] In this example, the shuttle valve 4 can be replaced by two switch valves. For example, a first switch valve and a second switch valve are set on both sides of the connection point between the pressure sensor 3 and the control valve 21. In this way, the mixer truck is in the first working mode. During the process of the two-way variable piston pump 13 delivering pressure oil to the quantitative piston motor 17, the first switch valve can be closed and the second switch valve can be opened. The pressure oil reaches the pressure sensor 3 through the second switch valve. The mixer truck is in the second working mode. During the process of the two-way variable piston pump 13 delivering pressure oil to the quantitative piston motor 17, the first switch valve can be opened and the second switch valve can be closed. The pressure oil reaches the pressure sensor 3 through the first switch valve.

[0040] The same or similar numbers in the drawings correspond to the same or similar parts; the positional relationships described in the drawings are only for illustrative purposes and should not be construed as limitations on this patent. Obviously, the above-described embodiments of the utility model are merely examples for clearly illustrating the utility model, and are not limitations on the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A hybrid hydraulic system for a concrete mixer truck, comprising a bidirectional variable piston pump, an oil replenishment pump, a manual reversing valve, a quantitative piston motor and an oil tank, characterized in that: It also includes an electric motor, a quantitative plunger pump, a reversing valve, a control valve and a pressure sensor; the two-way variable plunger pump and the oil replenishing pump are connected to the diesel engine drive shaft to form a first power source; the quantitative plunger pump is connected to the electric motor to form a second power source; the reversing valve is connected to the first power source through an oil circuit; the control valve is connected to the first power source and the second power source through an oil circuit; the quantitative plunger motor is connected to the reversing valve and the control valve; the pressure sensor is connected to the control valve; Among them, the oil-electric hybrid hydraulic system of the mixer truck has a first working mode and a second working mode. In the first working mode, the first power source delivers pressurized oil to the quantitative piston motor; in the second working mode, the second power source delivers pressurized oil to the quantitative piston motor.

2. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 1, characterized in that: The reversing valve comprises a one-way valve, a relief valve and a three-position four-way electromagnetic reversing valve. The three-position four-way electromagnetic reversing valve realizes forward rotation, reverse rotation and unloading of the quantitative plunger motor by switching the working position.

3. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 2, characterized in that: The oil inlet of the one-way valve is connected to the oil outlet of the quantitative plunger pump, and the oil outlet of the one-way valve is connected to the oil inlet of the three-position four-way electromagnetic reversing valve.

4. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 1, characterized in that: The control valve is disposed simultaneously on the oil circuit between the bidirectional variable displacement piston pump and the quantitative piston motor, and on the main oil circuit between the quantitative piston pump and the quantitative piston motor.

5. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 4, characterized in that: The control valve includes a first logic valve, a second logic valve and a third logic valve, which are simultaneously arranged on the oil circuit between the oil outlet of the bidirectional variable piston pump and the oil inlet of the quantitative piston motor, and on the oil circuit between the oil outlet of the quantitative piston pump and the oil inlet of the quantitative piston motor.

6. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 5, characterized in that: The control valve further comprises a shuttle valve, the inlet of the shuttle valve is connected to the oil outlet of the bidirectional variable plunger pump, and the outlet of the shuttle valve is provided with a pressure sensor.

7. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 6, characterized in that: The pressure sensor is used to detect whether the bidirectional variable displacement piston pump is in a working state.

8. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 6, characterized in that: The control valve also includes a first solenoid valve and a second solenoid valve, the first oil port of the first solenoid valve is connected to the control oil port of the third logic valve, the first oil port of the second solenoid valve is connected to the control oil port of the first logic valve, and the second oil port of the first solenoid valve is connected to the second oil port of the second solenoid valve and connected to the oil tank.

9. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 8, characterized in that: In the first working mode, the first solenoid valve and the second solenoid valve are in a de-energized state, the first logic valve and the second logic valve are in an open state and unloaded through the switching position of the second solenoid valve, and the third logic valve is in a closed state.

10. The oil-electric hybrid hydraulic system of a concrete mixer truck according to claim 8, characterized in that: In the second working mode, the first solenoid valve and the second solenoid valve are in an energized state, the first logic valve and the second logic valve are in a closed state, the third logic valve is in an open state and unloaded through the switching position of the first solenoid valve, and the hydraulic pump on the diesel drive side is in an unloaded state.

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